Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b99e7a8522dd3d8…

MALICIOUS

PDF

126.9 KB Created: 2021-09-06 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 0180c62c990f953f115b6d29860bee69 SHA-1: 39a79e2db1dc9edb0151d5e707a19d6a74f74514 SHA-256: 2b99e7a8522dd3d89206345bee7f64fc70707f389d27b2b6d39cd05f4434a50c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search results or lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://topflexsports.com/uploads/59845614367.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b98fe8f1d6e---vupugu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f02d52095---zadebasodeburiwapi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jejisod.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b1ad4o8l3nlnq5d36kpv9pq9k7/65157849181.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/71327303664.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc1e6f13e1---nomumutob.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/gipunozalir.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/958b8d358c9833b6e22f3e518f0a760c/87363757059.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3bf5bac3---70628859334.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7d88ec33---mamefirepilizosatasam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb99bfe58---redogajirif.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/sevikukidezujar.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/11739498674.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ffb0a889cc71687e351fbccee22078c5/debinajeriludob.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/49793769850.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210818_001725.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/firibibaxox.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jujimuzomatawefi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jjjvm5j5gbcpni144dovqqqpc2/27983413270.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b14d0657a---zibuvagaxitowozivijutof.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/dukolonalej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=holding+up+the+universe+jennifer+niven+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000182ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182EF 11148 bytes
SHA-256: 45d86b2dce221a8def1fd9d0c9dc5c95fdd5fb88124f6eff4a2a52557b23e4e8
font_01_sfnt_off00019cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CB0 21776 bytes
SHA-256: 6202cdff4f943e23d338804b2087c446294d138f5b76f06d70195c9409d7789e
font_02_sfnt_off0001d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1